Review on 🔋 O2COOL Treva 10-Inch Portable Battery Powered Fan - 2 Cooling Speeds - Includes AC Adapter and USB Charging Port for Desktop Air Circulation by Mario Schultz

I've bought about a dozen USB powered portable batteries and fans to take with me to various work places where I can't connect but I'm very hot. I bought three of these fans with USB connection. for battery discharge at work. All three failed. One broke after about an hour of use. The other failed after about 20 hours of use. I suspect the third one failed at the factory as it never worked here. All three failed at the USB level as all three were still plugged into a 110V outlet. Too bad because it would have been a better portable USB fan if the manufacturers had built one. It's somewhere where they understand the quality as Japan. This is not the fan you are looking for.